Reciprocating mechanism



Sepf.1s,1934.- HHB mm2@ REGIPROCATING MECHANISM Filed May 4, 1951 2 Sheets-Sheet l Patented Sept. 18, 1934 RECIPROCATIN G MECHANISM Harry H. Cobe, Chelsea, Mass., assigner to Cobe Engineering Company, Boston, Mass., a corporation of Massachusetts Appiiaation May 4, 193i, serial No. 535,010

4 Claims.

This invention relates to reciprocating mechanism and more particularly to electromagnetic reciprocating mechanism.

1t is an object 01 the invention to provide an eincient reciprocating mechanism which can be manufactured at low cost and which is economical to operate.

Another object of the invention is the provision of an improved electric pump.

prising a box-like casing having a hollow cylindrical portion 11 extending from each end. The bottom of the casing 10 is provided with a plurality of transversely extending ribs 12. The top of the casing 10 is closed by a cover 13 which is secured to the casing by screws 14 passing through the cover and engaging the casing. The cover 13 and the sides of the casing 10 are provided with spaced outwardly extendm A further object of the invention is the proing fins 15. A pipe 16 is secured in an exhaust vision of an eihcient electromagnetic reciprocatopening 17 in the cover 13. A sleeve 20 is xed ing mechanism, and particularly, such a mechawithin each projection l1 to provide a cylinder nisin in which the reciprocating element is actu- 2l which is closed at its outer end by a head 22 ated by the magnetic field produced by an alsecured to the projection 11 as by screws 23. A

35 ternating current. pipe 24 is secured in an intake passage Another object of the invention is the pro- 25 in the head 22. A valve 26 in the form of a vision or" an improved switch mechanism for didisc having a plurality of notches 27 on its perecting the flow of current alternately to two Tphely iS positioned in a recess 28 in the head 22 Sole-110mg to move axially therein toward and away from 30 Before explaining in detail the present invenits seat 29. The valve 26 when Open iS adapttion, it is to be understood that the invention ed to engage an abutment 30. is not limited in its application to the details A body rests upon the ribs 12 and is spaced of construction and arrangement of parts illuslOm the II'CSTOT Slllfae 0f the Casing 10 '00 PTO- .trated in the accompanying drawings, since the vde a reservoir 34 therebetween which may be invention is capable of other embodiments and Partially lille@ Will?. lubricant 33- The b0dy`35 of being practised or carried outin various ways. 1S plOVlOld Wlll a lOlgl'udllal PaS-lage 36 WhlCh Also it is to be understood'that the phraseology COmmlmICaSS Wlh SiJCed 21111111311 passages 37 or terminology employed herein is for the purand 38. Solenoids 39 and 49 are positioned in pose of description and not of limitation, and it the passage 37 and Solenoids 41 and 42 are p osi- 69 is not intended to limit the invention beyond the toned in the paSSag'S 38 ElSCllCl Supply 111185 terms ofA the several claims hereto appended as 48 and 49 from f1 SGUICP O alternating Current are considered in view of the prior art and the re- Connected to one terminal 50 of a switch 5l and quirements thereof. a terminal 52 respectively. rThe switch 51 com- The invention willbe more clearly understood DISES a 02151112 53 eXtolldmg between Solenoids 44 from the following description in conjunction and and having pockets 54 and 55 iilled with with the accompanying drawings: in which, mercury 56. The'solenoids 44 and 45 are con- Fig. 1 is a plan view partly in section of an IlSCtSCl Wlth SOlIlOldS 41 and 39 by Conductors 46 electric pump embodying the invention and diaand 47 respectively.. The terminal 5G is xed in grammatically showing the electrical connections Suitable 1IlSll1alJ1OD Wllhm the CaSlIlg 53 and serves 40 from the solenoids of the pump to one type of as a bearing 101 IOljatabllf .leClVlng an arm 57. switch mechanism which is shown in sectional A solenoid core 58 is positioned on the arm 57 elevation; below the terminal 5G and a counterweight 59 is Fig. 2 is a sectional view taken upon the line SllpDOlld above the telmllal 50. Termlnals 60 2 2 of Fig. 1; and 6i electrically connect the mercury in the [i5 Fig. 3 is an enlarged sectional View of a portion pockets 54 and 56 respectively. Conductors 62 of the pump; and 63 connect the terminals 6D and 6l with one Fig. 4 is a plan view of one oi the parts; end of the solenoid coils 4 0 and 42 respectively.

Fig. 5 is a sectional elevational view of the The other end o1 each or tne solenoids 4o and 42 pump shown in Fig. 1 and showing diagramis connected to the terminal 52 by conductors 43 matically the electrical connections from its soleand G4 respectively- L r noids to a switch mechanism of modied con-r In the embodiment oi the invention illustrated struction which is shown in sectional elevation; the bodv 1S Composed of a plurality of super- Fig. 6 is an enlarged sectional View of a por- DO Sed strips 65 Of magnell materlal Coated with tion of the pump; suitableinsulation. Preferably, the lstrips 65 are Fig. '7 is a sectional view taken on the line 7--7 high SlllCOrl H011, the Surface @f WlllChbaS been of Fig. 6; and oxidized toprovide a coating of insulating oxide.

Fig. 8 is a sectional View taken on line 8-8 A plate 67 1S DOSll'fl-Oled I lDOIl the SlllDS 65 and 1n of Fig 6 order to hold the strips in engagement is secured The invention is illustrated in the accompanyto the ribs 12 by Screws 68 passing through the G0 'ing drawings as applied to an electric pump complate 67 and each or the strips 65.

j' plunger 70 to vmove to the left as viewed in Fig. 1

the pivot so that its ends may engage either the arm 5'7 on opposite sides of the pivot 50.

A plunger is positioned in the longitudinal passage 36 and comprises a core '71 of suitable magnetic material, In'thel form illustrated the core '71 is formed Vby embeddingy a plurality of small wires '72 of magnetic material ina body '73 of insulating wax. The core '71 is enclosed by a sleeve r74 of suitable insulating material, such'as'A bakelite. A hollow cap '75 of suitableinsulating material, such as bakelite, is secured upon each end of the core '71 by nuts .'76 engaging rods '77 which extend through the core. Each cap is provided with one or more passages '78 connecting its interior with the passage 35. A hollow piston is secured upon the outer end of each cap '75 by a bolt 81 having a longitudinal passage 82 connecting the interior of the piston and cap. The other end of the cap is closed by a' plug 8 3 havinga passage 84 connecting the passages 78 and 82L A valve' 85,constructed the same as the valve 25, normally` is held'by a spring 86 against a valve seat 8'7'so'as to close a passage 88 in the head of the piston 80. When the valve is open it may engage an abutment 89..

t When the pistons 80 are moving out of the cylinderszl a depression is created in the cylinders causing the valves 26 to open and permit fiuid to enter the cylinders from the'intake passages 25. As the-pistons 80'move into the cylinders 21the fluidk therein is compressed until its pressure is equal orgreater than the pressure in the reservoir 34', whereupon the valve 85 is forced open against the action of spring 85.

' vThe switch arm 5'7'i`s adapted to swing upon the pivot 50 so that' its opposite ends alternately engage tl'ie mercury inthe pockets 54 and 55 so as to direct the current alternately from the lines 48 and 49 tothe solenoids40 and 42. YWhen the armf5'7 is immersed in the mercury in the pocket 55 alternating current issupplied from the lines 48 and 49 to the solenoid 42. This causes the to compress nuid in the cylinder21 at the left. As the'core '71 advances intothe solenoid coil 42 the Imagnetic' field surrounding the latter is increased to an extentsuiiicient to induce a current inthe solenoid coil 41jthereby energizing the sole- As a result' theV gradually increases until a pointis finally reached where the magnetic elds of the solenoids 41 and 42 are balanced thus bringing the core to a position of rest. When the arm 5'7 becomes immersed in the mercury in the pocket 54 the flow of cui'- lrent from the lines 48 and 49 is directed through the solenoidcoil 40 thus causing the plunger '70 to move to the right 'as 'viewed in Fig. 1 thereby compressing fluid in the cylinder 21 at the right.

In the' modied form of switch construction illustrated in Fig. 5, the arm 5'7' is mounted upon of the contacts 6'0 and 61. A projection 90 eX- tends upwardly from the arm 5'7 above the pivot 50 and engages an inclined leaf spring 93 xed upona support 94. Lugs and 9'6 depend from The solenoid plunger 58' is carried'by an arm 9'7 pivotally mounted at an intermediate point upon the pivot 50. A finger 98 near the other endv of the arm 9'7' is adapted to engage either of the lugs 95 and 96.

VThe arm 5'7 is shown in Fig. 5 in engagement with the contact 60 thereby connecting the solenoid coil 40' with the feed lines 48 and 49 therevby energizing the solenoid 40' to cause the plunger '70 to move tothe right as viewed in Fig. 5. In so doing a current is induced in the solenoid coil 39' to energize the solenoid coil 44 and attract the plunger 5'8 to move the arm 5'7 into engagement with the contact 514 thereby directing the current from the feed lines v48 and 49 to the solenoid coil 42'. Thus, the flow of current from feed lines 48 and 49 is alternately directed to the solenoids 40" and 42';

The laminated structure of the body 35 and the core '7l prevents the magnetic field of the solenoids from inducing a current therein flowing circumferentially of the aXis of the plunger, thus avoiding the generation of an 'excessive amount o f heat and utilizing the electrical energy in an' efficient inaiiner.V The lubricant 33 in the reser- 1. In an electromagnetic reciprocating mecha-` nism, in combination, a lmagnetic plunger, electromagnetic means for reciprocating said plunger, a switch for controlling the flow of current to said electromagnetic means, and means actuated in response to a current induced by the magnetic eld of said electromagnetic means for operating said switch.

2. In an electromagnetic reciprocating mechanism, combination, a magnetic plunger, two solenoids for reciprocating said plunger, a separate electrical conductor positioned in the magnetic field of each solenoid adjacent the path of travel ofthe plunge'n-and means actuated by the current induced in said conductors when said solenoidsare energized for directing the ow of current to saidV solenoids alternately.

- 3. -In an electromagnetic reciprocating mecha? nism, in combination, a magnetic plunger, two solenoids for reciprocating said plunger, a separate electrical conductor positioned near the outer region of the magnetic eld of each soleifi-5 noid adjacent the path of travel of the plunger,

and means actuatedV by the current induced inl said conductors when said solenoids are energized for directing the flow of current to said solenoids alternately. 4. InV an electromagnetic reciprocating mechanism, in combination, a body, a magnetic plunger, 3?.

two solenoids embedded in said body for reciprocating said plunger, a separate electrical conductor positioned in the magnetic eld of each solenoid adjacent the path of travel of the plunger, andmeans actuated by the current induced in said conductors when the solenoids are energized for directing the now of current to said solenoids alternately, said body comprising insulated members of magnetic material extending parallel to the path `of travel of the plunger. l

HARRY oo'BE.

les 

